Sound-reproducing head.



PATENTED NOV. 12,1907.

GJA. SMITH. .SOUND REPRODUGING HEAD.

APPLICATION FILED FEB. 28, 1908.

2 SHEETS-SHEET 1.

No. 871 ,0-0 Q. PATENTED NOV. 12, 1907.

Y C. A. SMITH.

SOUND RBPRODUGING HEAD.

APPLICATION FILED PER. 28, 1906.

2 SHEETS-SHEET 8.

CURTIS A. SMITH, OF ELGIN, ILLINOIS.

SOUND-REPRODUCING To all whomit may concern:

Be it known that I, CUR'rrs A. SMITH, a citizen of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements-inSound-Reproducing Heads, of which the following is-a specification.

My present invention relates to improvements in,

sound reproducing heads for sound reproducing. machines, and has for its object the production of a head wherein there are means for controlling the volume of sound delivered to the audience.

A further object of my invention is the production of a simplified means for providing a fulcrum for said stylus arm. I

To the attainment of these various objects my invention consists of the new'and novel structure and combinationof parts as will presently appear. I

In the drawings:-Figur e 1 is a side elevation of the various parts of my sound head separated but in position for assembly. Fig. 2 is an elevation of the assembled sound head. Fig. 3 is a top plan view of my sound head. Fig. 4 a sectional view of the assembled sound head, taken on line X X of Fig. 3; Figs. 5, 6, 7 and 8 are detail views showing the construction of my new muting device. Fig. 9 shows the various parts going into the construction of my new lever or stylus arm. Fig. 10 is a sectional view showing the various parts in Fig. 9 assembled to form the stylus arm or lever. Fig. 11 is an enlargedperspectiveview of one of the members forming the bearing or fulcrum for the stylus arm or lever. Fig; 12 is a vertical sectional view tln'ough the stylus arm and its bearing assembled with the head.

The numeral 1 designates the collar which fits'snugly over the sound conduit of a sound reproducing machine. 2 designates a stop which serves to secure the proper positioning of the sound head upon the sound conduit.

The numeral 4 designates a plate integral with the collar 1 which forms the back 'of my reproducing head. Through the plate 4 are the screw holes 5.

The numerals 6 designate the top plate of my sound head, and is provided with the round central aperture 7, the annular shoulder 8, the posts or pillars 9, and the screwholes 10 by means of which through the agency of the screws 11 it is attached to the plate 4. Between the plates 4 and 6 and contiguous with the annular. shoulder 8 is mounted the split tube 12, the split therein being designated by the numeral 13. Extending into the tube 12 through the split 13 is mounted the diaphragm 14.

In the holes 15 in the pillars-9 are mounted the pieces 16, which I prefer to make of hollow tubes, the inner ends of which are split at right angles to form the fingers 16, 16", 16, and 16, the ends of which said fingers, as shown in Fig. ll at 17,-engage the faces of the triangular projection 18 of the stylus arm or lever-19.

Specification of Letters Patent. Application filed February 28, 1906- Serial No. 303.393.

Patented Nov. 12, 1907.

The innen end 36 of the stylus arm or lever 19 is perforated, as shown at 20 in Figs. 9 and 10. A like perforation 21 i provided in the center (if the diaphragm. The ends 01' the piece 22, which I make of a flexible fiber, are i erted into the perforations 20 and 21, and properly secured with wax, cement, or other appropriate means, thus binding the diaphragm 14 and the stylus arm 19 firmly together.

When a proper adjustment is secured between the stylus arm 19 and the diaphragm 14, and between the stylus arm and the pieces 16, the said pieces 16 are secured and-maintained in their proper position by means "of the screws 11 working in the holes 10 as clearly shown in Fig. 12.

My new stylus arm or lever 19 consists of the hub 28 which I make in the form of a cube. Through the hub 28 and at right angles to each other I provide the holes 29 and 30. Into the hole 29 is inserted the tube 31 whose ends are each provided with the four triangular projections 18, the faces of which contact with and engage the fingers 16", 16*, 16 apd 16 In one end of the hole 30 is introduced the piece 32 which is pro vided upon its outer end with-the chamber 33 for the reception of the stylus 34, and the milled headed screw 35 for securely clamping the stylus in its chamber. In the other end of the hole 30 is introduced the inner end 36 of the stylus arm. When thc parts are assembled as above described, they can be readily swcated together with a little solder. The parts/as above dcscribcd can allbe made with automatic machinery, thereby permitting of a considerable economy in manufacture.

My improved muting device is constructed as follows: In the collar 1 is slidirrgly mounted the hollow cylinder 37 having in its wall the conical aperture 38. Adjacent to the aperture 38 in the wall of the collar 1 is provided the cylindrical aperture 39. In the aperture 39 is mounted the short shaft 40. having the diminished end 41 projecting beyond the outer surface of the collar 1. On the inner end of the shaft 40,

to one side of the center or cccentrically, is mounted .to the vibrating diaphragm 14, thereby shutting off the sound waves rising from the edges of the diaphragm and reducing the volume of sound delivered to the audience. For the purpose of maintaining the shaft 40 in place, I provide upon the outer surface of the collar 1 the plate 43 which is attached thereto by Patent is:

means of the screw 44. The plate 43 is provided with the liolel ig of sufiicient diameter to accommodate the diminished end 4 of the shaft 40. The hole- 45 .is further cjut awayto provide the shoulders '46 and 47.

Upon the diminished end 41m the shaft 40 are the 1. a pl votai supporttoria stylus arm having a member provided with; luralltgfotfzaxially .eatending parallel springniingers,andjpiealjs'for engaging the ends of said member.

2. Infcombination with a sound reproducing head hav ing a tube'lfunn in'g from the diaphragm chamber, a mute consisting of .a'jt ubular' body movably mounted in said tube and adapted 'to be moved to project into said dia phragm chamber, and means for moving and adjusting said mute at diflerent distances from'the vibrating diaphragm, said means extending through the walls of said tube and adapted to be manipulated from the exterior thereof.

3. In combination with a sound reproducing head, a mute consisting of a tube mounted in the passage for the escape of the sound, and an eccentric in engagement with said tube and operable to advance said tube towards and with draw it from the diaphragm.

4. In combination with a sound reproducing head, a mute consisting of a tube mounted in the opening for the pieces whose inner portions are split at right'ang escape'ot the sound, ashaft carrying an eccentric, said means for limiting the revolutions of th 5. In a sound reproducing head a sty angular projections, a spring fulcruinf'con's'i inner end 0! the divisions formed thereby contacting with and engaging thefaces of said angular projections.

' 6. In sound heads for sound reproducing machines, pieces carried .in adjustable assembly with said sound "head ,the inner portion of said pieces being split in sections, a stylus arm and projections carried upon each side .ofsaid stylus arm for engaging said sections.

7. A support for stylus arms in sound reproducing machines, comprising a plurality of axially eaten'ding fingers, means for trictionally engaging' and bending said fingers .to produce tension and a stylus arm.

v -8. A fulcrum for stylus arms in sound reproducing machines consis ":g of two pieceseach with a plurality of fingers to engage the stylus arm.

9. A fulcrum for stylus arms insound reproducing machines consisting of two pieces the ends of which are divided'into a plurality of fingers, means upon the stylus arm for engaging said fingers, and means for connecting saidpieces with the sound head.

10; Asound box comprising rear and side walls, a diaphragm therein, a sound box tube projecting from said rear wall and a sound modifier consisting of a (be movable within said sound box tube and adjustable into and out of CURTIS A. SMITH.

Witnesses:

BENJ. T. ROODHOUSE, E. M. PATTEBSOX. 

